Ibis Reader is a unique application because it is written in HTML5 and is a cross-platform EPUB reader that will work on iPad, iPhone, Android, and many other web-enabled devices. It has the ability to connect to remote content libraries that use the OPDS format which includes Feedbooks, the Internet Archive Book Catalog, Smashwords, the Pragmatic Bookshelf, as well as personal OPDS catalogs that you may wish to host on your own Cloud storage, such as on Dropbox.

Stanza allows you to purchase EPUB and MOBI format books from several sources and also allows you to import your own EPUB and other file format content thru iTunes or via the Open Source Calibre Content Server application.

Kobo has an attractive and streamlined book store. With Kobo, you can read all your purchased books from Kobobooks.com on several different computing and smartphone platforms, including PC, Mac, iPhone, iPad, Android, BlackBerry and Palm.

Apple iPad Showdown: Battle of the eReader Apps

An overview of the major eBook reader applications for Apple's iPad

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Stanza allows you to purchase EPUB and MOBI format books from several sources and also allows you to import your own EPUB and other file format content thru iTunes or via the Open Source Calibre Content Server application.